
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    text-decoration: none;
}

html,
body{
    width: 100%;
    height: 100%;
    font-size: 62.5%;
}

input[type='button']{
    webkit-user-select: none;
    user-select: none;
}

ul{
    list-style-type: none;
}

li{
    list-style-type: none;
}

/*包含以下四种的链接*/
a{
    text-decoration: none;
    color: black;
}
/*正常的未被访问过的链接*/
a:link {
    text-decoration: none;
}
/*已经访问过的链接*/
a:visited {
    text-decoration: none;
}
/*鼠标划过(停留)的链接*/
a:hover {
    text-decoration: none;
    color: black;
}
/* 正在点击的链接*/
a:active {
    text-decoration: none;
}